Learn the Ins and Outs of PDFs
We are here to help you become a PDF expert. We want to provide you with the tools and skills you need to tackle PDF-related tasks with confidence and ease.
Product updates
Try PDF Web Viewer now for free and unlimited time
You can now conveniently test our 4-Heights® PDF Web Viewer and the underlying PDF Viewing SDK without a license key and for unlimited time. You can obtain the software package via both our website and npmjs.com. On "My ...
Tech corner
TIFF Mixed Raster Content (MRC) conforming to RFC 2301
Mixed Raster Content (MRC) is a process to reduce the size of raster images. It is well known since PDF/A is used to archive scanned documents. However, it has been used and standardized in RFC 2301 for TIFF files earlie ...
Product updates
Form Filling and Stamping in the PDF Web Viewer
Earlier this year we have launched our brand new 4-Heights® PDF Web Viewer, the successor of the 3-Heights® PDF Web Viewer. Now we are proud to announce the arrival of two new features: PDF page stamps and form field fil ...
Tech corner
Stroking geometric paths - not as easy as it seems
In PDF geometric paths are simply described as lines and cubic bézier curves. The filling of a path is straight forward once one understands the even-odd and non-zero-winding rule. The stroking of a path however is not a ...
Product updates
All new from the inside: The PDF Web Viewer
Recent years have seen a tremendous increase in the use of web browsers as a new standard client platform, being available on almost any device and any operating system. Three years ago, we have responded to the need of ...
Tech corner
PDF transparency reviewed
This new blog thread is dedicated to the development of the PDF standard and its associated sub-standards. As a delegate of the Swiss Standardization Association (SNV) in the ISO Comittee I'm supposed to review all relat ...
Product updates
Prioritize PDF conversion speed or file size in the Conversion Service
The Conversion Workflow is designed to convert Office, image, text, email, and ZIP archive files to PDF. Existing PDF files can also be processed.
Tech corner
Controlling enveloping machines using OMR markers
In this new blog thread I'd like to inform you about new features and applications of our tools. Enveloping machines can be magically controlled with these tiny dashes called OMR markers on the border of a printed sheet. ...
Product updates
REST API for Efficient PDF Conversion - Seamlessly Integrate Your Document Workflows with the Conversion Service
PDF standards
Everything you should know about PDF/A-4
PDF/A-4 was published in the fall of 2020 and is therefore the latest part of the PDF/A series of standards. It is based on ISO 32000-2 (PDF 2.0) and is both an evolution of PDF/A-3, which is based on ISO 32000-2 (PDF1.7 ...
Product updates
New Features for the PDF Web Viewer
The proven and tested PDF Web Viewer has been given new features and a new look.
